pollmann



Nov. 3, 1,925.

C. DLLMANN PURNAUE FOR GRANULAR FUEL SUCH AS BROWN CUAL COKE 3 sneaks-shut 1 Filed Feb'. A16. 1924 Nav. 3, 1925.

c. DLLMANN FURNACE FOR GRANULAR FUEL SUCH AS BROWN COAL COKE Filed Feb- 16. 1924 3 Sheets-Sheet 2 Nov. 3, 1925.

- c. DULLMANN PURIACE POR GRANULAR FUEL SUCH AS BROWN COAL COKE Filed Feb. 16, 3 Sheets-Sheet 5 Patented Nov. 3, 1925.

U NITE'D SET ES eprice;

oLEMENs DLLM'ANN, 0F LIEEERTWOLKWITZ, NEAR LEIPZIG, GERMANY,` AssIGNoE To DEUTSCHE' PATENT GRUDEoEEN-EAERIK wALTEnRIEsCHEL saco., M. B; H., 0E

LIEBERTWOLEWTZ, NEAR LEIPZIG, GERMANY, a oonrona'rronfor GERMANY.

FURNAGE FOR GRANULAR FUEL SUCH As BROWN COAL oo-KE.

Application 'ledFebr'uary 16, 1924: SeriaINo; 693,347.

To all' whom ti mag/f concern:

Be it known that I, CLEMnNs DLLMANN, al citizen of` Germany,- residing at Liebertwolkwitz, near Leipzig, Germany, have invented certain new and useful Improvements in Furnaces for` Granular Fuel Such as Brown Coal Coke (for which I have filed applications in Germany, July 4, 1923;

Czechoslovakia, September 1, 1923), of l0 which the following is a specification.

My invention relates to improvements in furnaces for granular fuel such as brown coal coke (the solid residue of the distillation of brown coal), and more particularly in furnaces of the class in which the main fire place cooperates with a subsidiary fire place provided for igniting the fuel charged on the main lire place, and the object of the improvements is to provide a furnace in which the flues are so disposed that the fuel on the subsidiary lire place can readily be ignited, and that a high heat economy is insured and the air supporting combustion is preheated. With this object in view my invention consists in the matters to be described hereinafter and particularly pointed out in the appended claim.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawings in which the same reference characters have been used in all the views to indicate corresponding parts. In said drawings,

Fig. 1, is a vertical section of the furnace taken on the line 1-1 of Fig. 3,

Fig. 2, is a section taken on the line 22 of Fig. 3, and

Fig. 3, is a horizontal section taken on the line 3-3 of Fig. 1.

In the example shown in the drawings my improved furnace comprises an outer wall 5, an inner wall 6 spaced therefrom so as to provide a flue, a fire place 1 consisting of a plurality of grates 27 placed one above the other', 'a subsidiary or igniting fire place 2, a fuel storage chamber 4, ash boxes 15a, Y a water tank 17, a door 18 through which the subsidiary fire place 2 is accessible, a spark arrester 14, and a shaft 9 closed by a lid 13 for supplying fuel to the storage chamber 4. Fuel is delivered from the chamber 4 to the grate bars 27 by rocking grates 28 forming parts of the bottom of the said 'chamber into vertical positions, as is indicatedfinFig. 1 ini dottedlines. The grate bars 27 areV rockingly mounted, andiff/it'- is desi-'red' to prevent the downward 'How'y of the fuel beyond a certain horizontal series of grate bars, the gra-te bars of the said series are rocked into position for providing a closed partition, as is indicated in Fig. 1 in which the dotted lines show the grate bars of the second series in inclined positions.

In the example shown in the figures the subsidiary lire place 2 is located at the right hand side of the furnace and air for supporting combustion is supplied thereto through an air inlet 19 located near the left hand side of the furnace and in the rear wall thereof and provided with well known means 29 controlling the supply of air. From the said inlet the air flows to the subsidiary lire place 2 through a passage 3 running along the rear wall and to the right and providing a. preheating chamber for the air. From the subsidiary fire place 2 the curent of air or burnt gas flows into the median part of the furnace, through the main fire place 1, and to the left hand wall of the furnace. the flue passing along the outer wall and they flow either upwardly or downwardly. If it is desired to ignite the fuel on the main fire place, a strong draught is required, and therefore a gate orslide 8 with a handle 7 provided in the hollow top 12 of the furnace is opened, so that the gases directly fiow upwardly and through the hollow top and to a lateral pipe 21. The hollow top 12 is traversed only by the fuel charging shaft 9, so that the resistance of the air flowing through the same is small. The flow of the Now the gases pass through gases has been indicated in Fig. 1 by a y v dotted line 23.

If the main fireplace 1 is in operation the slide or gate 8 is closed, whereupon the gases coming from the main fireplace flow downwardly through the branch of the flue provided between the walls 5 and 6, thereafter to the right and upwardly into the hollow top 12, through the same and to the pipe 21, as has been indicated by a full line 24, 25, 26.

By causing the gases to move along the outer wall of the furnace a high heating effect is produced.

While in describing the invention reference has been made to a particular example embodying the same I wish it to be understood that my invention is not limited to the construction shown in the drawing, and that various changes may be made in the general arrangement of the furnace and the construction of its parts without departing from the invention. Y

claim:

A furnace for brown coal coke, comprising the walls of the furnace, a main lire place, a subsidiary fire place at one side of the furnace adapted to supply gases of combustion to the main fire place, an air passage running from an air inlet along `other one downwardly, along'the wall and the bottom of the furnace and upwardly again to the chimney pipe, and means for 4 closing the upwardly directed branch of the flue directly connecting the fire place and the chimney pipe.

fn testimony whereof I have affixed my Signature.

CLEMENS DULLMANN. 

